A Highly Efficient Copper(I)-Catalyzed Cascade Reaction of<i>o</i>-Alkenylphenyl Isothiocyanates with Isocyanides Leading to 5<i>H</i>-Benzo[<i>d</i>]imidazo[5,1-<i>b</i>][1,3]thiazines
作者:Wenyan Hao、Jian Huang、Shanshan Jie、Mingzhong Cai
DOI:10.1002/ejoc.201500800
日期:2015.10
The highlyefficientcopper(I)-catalyzedcascadereaction of (E)-3-(2-isothiocyanatophenyl)acrylates and (E)-3-(2-isothiocyanatophenyl)acrylonitriles with isocyanides was explored. The method provides an expedient route for the synthesis of 5H-benzo[d]imidazo[5,1-b][1,3]thiazines in good to excellent yields by using CuCl (10 mol-%) as the catalyst and K3PO4 (2.0 equiv.) as the base in THF at 70 °C
New simple synthesis of ring-fused 4-alkyl-4<i>H</i>-3,1-benzothiazine-2-thiones: Direct formation from carbon disulfide and (<i>E</i>)-3-(2-aminoaryl)acrylates or (<i>E</i>)-3-(2-aminoaryl)acrylonitriles
A new simple and efficient method to construct ring-fused 4-alkyl-4H-3,1-benzothiazine-2-thione derivatives has been developed from carbondisulfide and (E)-3-(2-aminoaryl)acrylates or (E)-3-(2-aminoaryl)acrylonitriles under mild conditions, without the need for a metal catalyst. The newly developed method tolerates a wide range of substrates in moderate to excellent yields. Moreover, this method is